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BuckyE wrote:
It seems to me a set of concentric ridges would not mill very well.
I'm no expert either, but I can still see those ridges as indcatig millstone-ness. There's nothing to indicate that the centre of the stone was in what would be the top left of SL's photo.

If the hole of this putative millstone were at the top right, then the grooves would be placed in such as way as to do the business with the grain.

Hob wrote:
If the hole of this putative millstone were at the top right, then the grooves would be placed in such as way as to do the business with the grain.
'tis true. They could be radiating curved lines.

Imagine this one, but with the lines slightly curved - http://www.ics.uci.edu/~eppstein/pix/mendocino5/fr/Millstone2-m.jpg

or this one - http://www.dm-exp.org/gallery/siilinmylly/dm-pia_siilinmylly12.jpg

It's just a pity that the surface of the rock is quite uneven - have a look at this picture of this broken-up carved stone in Ireland ( http://www.irishmegaliths.org.uk/zKillycluggin1.htm ) and imagine using that as a millstone. I am the only commentator that has seen the stone and the suggestions that it was a millstone are just ridiculous. (Similar to describing a dog as a giraffe). We know the history of the area very well - the local history society - the softback locally-published guides - the estate map - and there has never been a flour mill within at least two miles. "You're as good as your last gig".

It's just a pity that the surface of the rock is quite uneven - have a look at this picture of this broken-up carved stone in Ireland ( http://www.irishmegaliths.org.uk/zKillycluggin1.htm ) and imagine using that as a millstone. I am the only commentator that has seen the stone and the suggestions that it was a millstone are just ridiculous. (Similar to describing a dog as a giraffe). We know the history of the area very well - the local history society - the softback locally-published guides - the estate map - and there has never been a flour mill within at least two miles. "You're as good as your last gig".

But what I really need is a copyright-free image - preferably a Victorian print - of a stone with a carved circle or spiral square on. Two adjoining circles would be ideal.